Outdoor thermometer



FIG. 1 is a perspective view shown of an outdoor thermometer showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a rear perspective view thereof; and,

FIG. 4 is a side elevational view with the opposite sides being mirror images thereof.

The portions shown in broken lines are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an outdoor thermometer, as shown and described. 